Beneath the adorable, rounded art style lies a bloody and brutal dark fairy tale. The war between teddy bears and unicorns has raged for a very, very long time. Hordes of young bears undergo harsh military training in boot camp, taught that "unicorns are demons," before being sent to the battlefield. In truth, Private Bluet craves unicorn blood because a prophecy suggests it can grant eternal beauty. A unit of young bears leaves the training camp on a mission, heading toward a cruel and catastrophic final battle.